Cellular Network Infrastructure » Radio Access Network » OsmoBTS

Using sysmobts with 201705-nightly, which contains latest master. Last commits in libosmocore contain some lapdm related commits.

libosmocore Version: 0.11.0+gitr1+f1bdf781ac-r0.
osmo-bts Version: 0.11.0+gitr1+f1bdf781ac-r0.

I'm running a complete core network in my sysmobts. I have 2 MS registered with the core network. I try to call from one MS to another one. Phone call starts in MO but finishes after a few seconds. Nothing shows ups in MT.

I attach the pcap trace taken in the sysmobts while placing the call, and the osmo-bts-sysmo with gsmtap enabled and following log categories enabled:

  logging level rsl info
  logging level oml info
  logging level rll notice
  logging level rr notice
  logging level meas notice
  logging level pag info
  logging level l1c info
  logging level l1p info
  logging level dsp info
  logging level abis notice

gsmtap enabled catgories:

 gsmtap-sapi bcch
 gsmtap-sapi ccch
 gsmtap-sapi rach
 gsmtap-sapi agch
 gsmtap-sapi pch
 gsmtap-sapi sdcch
 gsmtap-sapi tch/f
 gsmtap-sapi tch/h
 gsmtap-sapi pacch
 gsmtap-sapi pdtch
 gsmtap-sapi ptcch
 gsmtap-sapi cbch
 gsmtap-sapi sacch

There seems to be some issues in lapdm during paging command:

May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099398/74/00/50/18 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0000> ../../../git/src/common/rsl.c:2620 (bts=0,trx=0,ts=0,ss=0) Rx RSL PAGING_CMD
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0005> ../../../git/src/common/paging.c:225 Add paging to queue (group=4, queue_len=1)
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099402/74/04/03/22 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0000> ../../../git/src/common/rsl.c:2567 (bts=0,trx=0,ts=0,ss=1) Handing RLL msg UNIT_DATA_IND from LAPDm to MEAS REP
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099406/74/08/07/26 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099411/74/13/12/31 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099415/74/17/16/35 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099419/74/21/20/39 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099424/74/00/25/44 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099428/74/04/29/48 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099432/74/08/33/00 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099437/74/13/38/05 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099441/74/17/42/09 Rx TCH.ind chan_nr=0x09
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0011> ../../../git/src/gsm/lapdm.c:715 received message not permitted<0011> ../../../git/src/gsm/lapdm.c:419 sending MDL-ERROR-IND 8
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0000> ../../../git/src/common/rsl.c:2590 (bts=0,trx=0,ts=1,ss=0) Fwd RLL msg ERROR_IND from LAPDm to A-bis
May 09 10:25:31 sysmobts-v2 osmo-bts-sysmo[1276]: <0007> ../../../git/src/common/l1sap.c:1119 099450/75/00/00/18 Rx TCH.ind chan_nr=0x09

which corresponds to frame 185-193 in the pcap trace.